Role in the series
Diana Harp is fashionable, bossy, sassy and really selfish sometimes but she has a nice side in her too. Diana Harp used to be enemies with Sonja and now she is friends with her. Diana is also boastful like boasting that she's the fashion model that everybody loves
Francesco Bernoulli Edit
Diana's boyfriend. When Diana first met him she is really nervous when it comes to love. She and Francesco are really close through out the series.
Sonja Farrington Edit
Sonja and Diana are current friends and former enemies. In Sonja's Adventures of Cars 2, Sonja encourages Diana to talk to Francesco and asks her that she is in love which Diana yells that she is not in love. Sonja always reminded of herself when she is trying to hide her feelings from Alister when she is in love.
Summer Hill Edit
Diana Harp's best friend. She and Diana are enemies with Sonja at first and now they are friends. According to Diana in Sonja's Adventures of Cars 2, she and Summer are close childhood friends since they are in Kindergarten.